#!/usr/bin/env python
# vim:fileencoding=utf-8
# License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>

from __future__ import absolute_import, division, print_function, unicode_literals
import json
import random
import time
from base64 import standard_b64encode
from datetime import date, timedelta
from mechanize import Request

from calibre.web.feeds.news import BasicNewsRecipe, classes
from css_selectors import Select

try:
    import urllib.parse as urlparse
except ImportError:
    import urlparse
try:
    from urllib.parse import quote
except ImportError:
    from urllib import quote


needs_subscription = True


def substring_classes(classes):
    q = frozenset(classes.split(' '))

    def matcher(x):
        if x:
            for candidate in frozenset(x.split()):
                for x in q:
                    if x in candidate:
                        return True
        return False
    return {'attrs': {'class': matcher}}


class WSJ(BasicNewsRecipe):

    if needs_subscription:
        title = 'The Wall Street Journal'
    else:
        title = 'The Wall Street Journal (free)'
    __author__ = 'Kovid Goyal'
    description = 'News and current affairs'
    language = 'en'

    compress_news_images = True
    compress_news_images_auto_size = 7

    timefmt = ' [%a, %b %d, %Y]'
    no_stylesheets = True
    ignore_duplicate_articles = {'url'}
    remove_attributes = ['style','height','width']
    needs_subscription = needs_subscription
    WSJ_ITP = 'https://www.wsj.com/print-edition/today'

    extra_css = '''
        .imageCaption{font-size:small; text-align:center;}
        .sub-head{font-style:italic; color:#404040;}
        .bylineWrap{font-size:small; text-align:left;}
    '''

    keep_only_tags = [
        classes('wsj-article-headline-wrap articleLead bylineWrap bigTop-hero'),
        dict(name='section', attrs={'subscriptions-section':'content'})
    ]

    remove_tags = [
        classes('wsj-ad newsletter-inset media-object-video media-object-podcast podcast--iframe dynamic-inset-overflow-button'),
        dict(name='amp-iframe')  # interactive graphics
    ]

    def preprocess_html(self, soup):
        for by in soup.findAll(**classes('bylineWrap')):
            for p in by.findAll('p'):
                p.name = 'span'
        for img in soup.findAll('amp-img'):
            img.name = 'img'
            if img['src'] == 'https://s.wsj.net/img/meta/wsj-social-share.png':
                img.extract()
        h2 = soup.find('h2', attrs={'class':'sub-head'})
        if h2:
            h2.name = 'p'
        return soup

    def get_cover_url(self):
        index = 'http://en.kiosko.net/us/np/wsj.html'
        soup = self.index_to_soup(index)
        for image in soup.findAll('img', src=True):
            if image['src'].endswith('750.jpg'):
                return image['src']
        self.log("\nCover unavailable")

    # login {{{

    def get_browser_for_wsj(self, *a, **kw):
        br = BasicNewsRecipe.get_browser(self, *a, **kw)
        br.set_cookie('wsjregion', 'na,us', '.wsj.com')
        br.set_cookie('gdprApplies', 'false', '.wsj.com')
        br.set_cookie('ccpaApplies', 'false', '.wsj.com')
        return br

    if needs_subscription:
        def get_browser(self, *a, **kw):
            from pprint import pprint
            pprint
            # To understand the login logic read app-min.js from
            # https://sso.accounts.dowjones.com/login
            itp = quote(self.WSJ_ITP, safe='')
            start_url = 'https://accounts.wsj.com/login?target=' + itp
            self.log('Starting login process at', start_url)
            br = self.get_browser_for_wsj(*a, **kw)
            # br.set_debug_http(True)
            res = br.open(start_url)
            sso_url = res.geturl()
            query =  urlparse.parse_qs(urlparse.urlparse(sso_url).query)
            query = {k:v[0] for k, v in query.items()}
            # pprint(query)
            request_query = {
                'username': self.username,
                'password': self.password,
                'client_id': query['client'],
                'tenant': 'sso',
                '_intstate': 'deprecated',
                'connection': 'DJldap',
                'headers': {
                    'X-REMOTE-USER': self.username,
                    'x-_dj-_client__id': query['client'],
                },
            }
            for cookie in br.cookiejar:
                if cookie.name == '_csrf':
                    request_query[cookie.name] = cookie.value
            for k in 'scope connection nonce state ui_locales ns mars protocol redirect_uri'.split():
                if k in query:
                    request_query[k] = query[k]
            # pprint(request_query)
            login_url = 'https://sso.accounts.dowjones.com/usernamepassword/login'
            # you can get the version below from lib-min.js
            # search for: "\d+\.\d+\.\d+"
            # This might need to be updated in the future
            auth0_client = json.dumps({"name": "auth0.js-ulp", "version": "9.11.3"})
            if not isinstance(auth0_client, bytes):
                auth0_client = auth0_client.encode('utf-8')
            auth0_client = standard_b64encode(auth0_client)
            if isinstance(auth0_client, bytes):
                auth0_client = auth0_client.decode('ascii')
            rq = Request(login_url, headers={
                'Accept': 'text/html',
                'Accept-Language': 'en-US,en;q=0.8',
                'Origin': 'https://sso.accounts.dowjones.com',
                'Auth0-Client': auth0_client.rstrip('='),
                'X-HTTP-Method-Override': 'POST',
                'X-Requested-With': 'XMLHttpRequest',
                'X-Remote-User': self.username,
                'x-dj-client_id': request_query['client_id'],
            }, data=request_query)
            self.log('Sending login request...')
            try:
                res = br.open(rq)
            except Exception as err:
                if hasattr(err, 'read'):
                    raise Exception('Login request failed with error: {} and body: {}'.format(err, err.read().decode('utf-8', 'replace')))
                raise
            if res.code != 200:
                raise ValueError('Failed to login, check your username and password')
            br.select_form(nr=0)
            self.log('Performing login callback...')
            res = br.submit()
            self.log('Print edition resolved url:', res.geturl())
            self.wsj_itp_page = raw = res.read()
            if b'/logout' not in raw:
                raise ValueError(
                    'Failed to login (callback URL failed), check username and password')
            return br
    else:
        def get_browser(self, *a, **kw):
            br = self.get_browser_for_wsj(*a, **kw)
            res = br.open(self.WSJ_ITP)
            url = res.geturl()
            if '/20210913/' in url:
                today = date.today()
                q = today.isoformat().replace('-', '')
                try:
                    res = br.open(url.replace('/20210913/', '/' + q + '/'))
                except Exception:
                    today -= timedelta(days=1)
                    q = today.isoformat().replace('-', '')
                    res = br.open(url.replace('/20210913/', '/' + q + '/'))
            self.log('Print edition resolved url:', res.geturl())
            self.wsj_itp_page = res.read()
            return br
    # }}}

    def abs_wsj_url(self, href, modify_query=True):
        if not href.startswith('http'):
            href = 'https://www.wsj.com' + href.replace('/articles/', '/amp/articles/')
        if modify_query:
            href = href.replace('/articles/', '/amp/articles/')
        return href

    def wsj_find_articles(self, url, ahed=False):
        root = self.index_to_soup(url, as_tree=True)
        CSSSelect = Select(root)
        articles = []
        for container in root.xpath('descendant::div[contains(@class, "WSJTheme--list-item--")]'):
            heading = next(CSSSelect('h2, h3', container))
            a = next(CSSSelect('a', heading))
            title = self.tag_to_string(a)
            url = self.abs_wsj_url(a.get('href'))
            desc = ''
            for p in container.xpath('descendant::p[contains(@class, "WSJTheme--description--")]'):
                q = self.tag_to_string(p)
                if 'Subscriber Content' in q:
                    continue
                desc += q
                break

            articles.append({'title': title, 'url': url,
                             'description': desc, 'date': ''})
            self.log('\tFound article:', title)
            self.log('\t\t', desc + " " + url)
            if self.test and len(articles) >= self.test[1]:
                break

        return articles

    def wsj_find_wn_articles(self, feeds, root, CSSSelect):
        articles = []
        for a in CSSSelect('.style--strap--ND8Cuaip'):
            if 'WHAT\'S NEWS' in self.tag_to_string(a).upper():
                whats_news = a.getparent()
                break
        else:
            self.log.error('Failed to find Whats News section')
            return
        for li in CSSSelect('li', whats_news):
            a = next(CSSSelect('a', li))
            if '/articles/' not in a.get('href', ''):
                continue
            title = self.tag_to_string(a).strip()
            url = self.abs_wsj_url(a.get('href'))
            desc = self.tag_to_string(li)
            articles.append({'title': title, 'url': url,
                                'description': desc, 'date': ''})

            self.log('\tFound WN article:', title)
            self.log('\t\t', desc + " " + url)

        return articles

    def wsj_add_feed(self, feeds, title, url):
        try:
            for i in range(5):
                articles = self.wsj_find_articles(url)
                if articles:
                    break
                else:
                    pause = random.choice((1, 1.5, 2, 2.5))
                    self.log.warn('No articles found in', url, 'retrying after', pause, 'seconds')
                    time.sleep(pause)
        except Exception:
            self.log.exception('Failed to parse section:', title)
            articles = []
        if articles:
            feeds.append((title, articles))
        else:
            self.log.warn('No articles found in', url)

    def parse_index(self):
        # return self.test_wsj_index()
        root = self.index_to_soup(self.wsj_itp_page, as_tree=True)
        CSSSelect = Select(root)
        # from calibre.utils.ipython import ipython
        # ipython({'root': root, 'CSSSelect': CSSSelect, 'raw': self.wsj_itp_page})
        for inp in CSSSelect('.DayPickerInput > input'):
            if inp.get('placeholder'):
                self.timefmt = inp.get('placeholder')
                break

        feeds = []
        for container in root.xpath('descendant::*[contains(@class, "WSJTheme--top-menu-item--")]'):
            for a in container.xpath('descendant::a[contains(@class, "WSJTheme--section-link--")]'):
                frontpage = a.get('href').endswith('frontpage')
                title = self.tag_to_string(a).capitalize().strip().replace('U.s.', 'U.S.')
                if not title:
                    continue
                url = self.abs_wsj_url(a.get('href'), modify_query=False)
                self.log('Found section:', title, 'at', url)
                self.wsj_add_feed(feeds, title, url)
                if frontpage:
                    articles = self.wsj_find_wn_articles(feeds, root, CSSSelect)
                    if articles:
                        feeds.append(("What's News", articles))
                if self.test and len(feeds) >= self.test[0]:
                    break
        return feeds

    def test_wsj_index(self):
        return [
            ('Testing', [
                {'title': 'Subscriber Article',
                 'url': self.abs_wsj_url('https://www.wsj.com/articles/egg-prices-jump-as-bird-flu-hits-poultry-flocks-11648900800')},
            ]),
        ]
